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Technology

All Geosense Tilt Meters use MEMS or Electrolytic technology.

MEMS

MEMS is a chip-based technology, known as a Micro Electro-Mechanical System, that is composed of a suspended mass between a pair of capacitive plates. When tilt is applied to the sensor, the suspended mass creates a difference in electric potential which is measured as a change in capacitance. This signal is then conditioned to provide either an analogue or digital signal.

One advantage of MEMS sensors is that temperature effect on the sensor is very small compared to Electrolytic although temperature effects of the system and in particular the fixings should always be considered.

Electrolytic

An electrolytic tilt sensor provides an output voltage that is proportional to the tilt angle of the sensor with reference to gravity. A typical tilt sensor has three electrodes: a common electrode and two outer electrodes. As the sensor is tilted, the electrolytic fluid inside the sensor covers more or less of the outer electrodes depending on the direction of tilt. The tilt is calculated by measuring the difference in electrical impedance between the two outer electrodes to the common. This signal is then conditioned to provide either an analogue or digital signal.

One of the disadvantages of electrolytic sensors over MEMS is that they are significantly affected by temperature but are more resistant to vibration over MEMS.

Biaxial or Uniaxial

All Tiltmeters have the option of being supplied with Single or Dual axis Tilt boards.  Biaxial is generally slightly more expensive so depending on your application or measurement requirements, you are able to make a decision on which would be better suited and potentially save some cost where you can get by with Single Axis measurements.

Water resistant

Standard Tiltmeters are supplied in an IP66 enclosure meaning they are protected against strong jets of water (i.e. heavy rain).  If there is any chance at all of the Tiltmeter becoming submersed, a Submersible Tiltmeter (IP68 to 200m) should be used. 

 EMC Compliant

Our Tiltmeters have been manufactured to meet the Electromagnetic Compatibility Directive 2004/108/EC, to ensure there is no chance of being affected by electrical noise on any site.  When a cable is being routed from each sensor there are specific requirements that need to be met with regards to the type of cable and how it is terminated.  Geosense provide a Low Smoke Halogen Free cable with a braid with all Tiltmeters, Tiltbeams and In-Place Inclinometers.  When the cable needs to be spliced it is important to contact Geosense to supply an EMC splice kit which will ensure the EMC compliance is throughout the cable route.